Auxiliary reenforcement for reenforced concrete construction



Aug. 10,1926. Lsssgmz4 v S. D. BUTTERW'ORTH AUXILIARY REENFORCEMENT FORREENFORCED CONCRETE CGNS'SRUIJTI0N4 Filed Augusl, 1924 2 Sheets-Sheet 11,595,222 s. D. BUTTERWORTH AUXILIARY REENFCRCEMENT FOR REENFCRCEDCONCRETE CONSTRUCTION Aug'. 10 19.26.

Filed August 16, 1924 2 Sheets-Sheet 2 Patented Aug. 10, 1926.

" rss SAMUEL D. BUTTERWORTI'I, 0F LANSING, MICHIGAN.

AUXILIARY BEENFORCEMENT FOB. IRfEl-NIEO:El/CEDfCO1\TCRIE1'JECONSTRUCTION.

Application filed August 16, A19.24.. Serial No.; 732,385.

This invention relates toa reenforcing 4member for ,securing Vconcreteto the under side oflbeams The underwriters and most building codesrequire the `contractor to `-cover-zinlfheam with-at least two inches ofeo 'nc rete for fire protection. This means that the .gI-beambr Vothersteel section used in concrete'beam construction must'be entirelysurrounded ,by concrete so thatthe loutsider :surface of ,the concreteLis Yat least Atwo inches ,from any point of thelfheanm However, ,greatdiflicultyhasbeen: experienced in hold- Aing the e concrete `to the.bottom ofthe l-beam, as' the bott-om of the beam is smooth ,and theconcrete ,thereover is suspended `,merely by the two inches .of concretelatv the side.`

@here .isgreatdanger of this portionofthe lconeretebeam peeling oli vandfalling after ,the .building has been constructed, which,V

,mightcause seriousfdamage and loss of life.

Many devices have beendevised for ,hold- .ingthisconcretetothe .Lbeannbut as feras .I know, .thesedevices have not proven en- .,tirelysatisfactory. The deviceson themary.ket are ofsuchaconstruction:thatthey vwill slip and as 1these .reenforcingdevices need to ,be `spaced.,accurately, -v1t 1s quite .necessary that fthey should kstay put. It.has been the icustom .to wrap :these I-'beams with a wire ,O rsteelcoil, `locating these Vwires atapproximat-elyone :foot apart.Butduringthe proc- .ess ,of `building the .box .frame vabout the I-`.beam -in preparation `for pouring the concret-e, these wire coils areeasily misplaced :and there is a greatchance otthem all sliding .towardsone end of lthe beam, thereby .leaving a great section of ythe beamwithout ,this necessary freenforcement. With {these devices, however,`it is necessary to also prende-spacers for correctly positioning-and eholding the mold box in 4correct relation with .respect to the I-beam,so that kthe min- Efimum allowance of two -inches of concrete may hemaintained.

The object of my 'invention is to overcomethese numerous difficultiesand l pro- .vide a reenforcing member which may be clamped to the Iebeamin such a way -that the same 'will not y'slip and will :remain put. Inaddition, my constructionincludes means @for spacing the mold box fromYthe I-beam,

thereby performing a double'function not v found in Vthe .devices inlthe prior artz In addition, my device may he ormedot a sta-mpandmanufactured at very low" cest.

'ln fact the samemay besold at less costlthan 'thedevices now on themarket and vtheyvare also labor saving devices since they are morereadilyeand quickly assembledfto the 'Lbeam in preparation `for lpouring.the ,concrete.

ln the drawings:

Fig. l isa perspective view ot an showing my reenforcing clamps thereto.

Fig, 2 is a perspective of one of ,my clamps. Y

Fig. 3 is assection through an I-heam, shcwingthekelamp about tobe puton.

lflg.V Lis aside elevationof the I-.-beam, sh-owing my .reenforcingclamp secured thereon. Y

Fig. l5 is .a vertical ,section .through a concrete ,beam reenforced byl an .I-.beam `section :and showing my lreenforcing clamp isecuredthereon. Y Y

.Fig 6 is a -sectional view lthrough an I- beamxsection used foracolumn, showing my reenforcing members securedthcreto. l

'Figa-'7 is a perspective .viewo myfclamps showing' Athe struck out.transverse `reeniorc- 4ing tongues.

`Fig. 8 ,is adetail of the blank used .for forming' ,the clampingmembers,

a designates an ALbeam that `is used .for reeutorcing a concrete beam,.the `concrete designated b, .as ,shownk in Fig. 5, to hold that portionofthe concrete designated b1 lin place, `and `to .prevent rthe same`from falling ott" after :the vconcrete has set, I vprovide a,reenforcingfdevice which is ,adapted 4to be secured to `this -I-beam aswill know be described.

l .form .a .special fixture or Yflange clamp `of sheet metal form-edfrom a stamping Vin such ;a vway as to provide `a `rspring vclip c heam,secured Ywith `the inwardly entendi-ng-sprfingggripping e jaws .orfingers d. Itis also provided with a depending' leg e, which serves :asa'spacer Afor locating the bottom fof the Y.mold 'trough 1n correctposition with respect to the I beam. This special .fixture or lclamp isalso provided with a side extension f, which serves as a spacer for thesides of tthe Amold box. The depending leg carried .by t-he fixture ispro-vided with an inwardly `struck out tongue g.

'This Yiixture may :be zforced onto the bottom flange 'of the I-'be am,as shown in'Figs. B and 5, the spring gripping fingers or CJI Cil

' struction.

d engaging the upper surface of this flange, and as the same is forcedon, these gripping members will tightly grip and bite into the I-beamfiange and so securely grip the I- beam that there is no tendency 'forthe clamp to slip or become misplaced. These clamping fixtures aresecured on opposite sides of the I-beam, as shown in Fig. 5, the tongueg bridging the `gap beneath the I-beam to provide a transversereenforcement for the concrete. fr steel rod 7L may be laid thereon, asshown in Fig. 1l, when a broad I-beam is used to provide a strongertransverse reenforcement for tying the concrete designated 1 to thecentral reen'forcing member of the I-beam.

These fixtures are normally positioned about one foot apart butsometimes they are positioned at a greater distance and there? for Atoprovide the necessary reentorcement for the intervening space betweeneach pair of fixtures, a reen'forcing rod z' is laid on top of the rodsh` and is positioned longitudinally of the I-beam. These reenforcingrods may be secured together Where they cross by means of the Wire loop.7'. HoW- ever, I Want it understood that I am not bound to always usethis longitudinally running reeniorcing member z', as there' areoccasions when it is not necessary.

After these fixtures have been secured to the I-beam, the box `frame 7cis secured about the I-beam, the spacers f and e locating the sides andthe bottom respectively oi the mould box in the correct position. Theconcrete is nouT poured and the same flows around these reenforcingfixtures and When the concrete is set all parts of the auxiliaryreenforcing fixture are embedded in the concrete, thus securely tyingthat portion of the concrete beam designated b1 to the centralreenforcing steel I-beam.

In Fig. 6 I show how my reenforcing ixture is adapted to be used incolumn con- In column construction there is the same requirement as tothe amount ot concrete around the I-beam, and to provide means forreenforcing the concrete and for spacing the column mould with respectto the I-beam, I place a number of my fixtures on both flanges of theI-beam section, as clearly shown in Fig. 6. Thus, When the concrete ispoured the same is sufficiently reenforced and prevents that portion ofthe concrete adjacent the outside flanges of the I-beam section frompeeling oli' and falling after the concreteis set.

Fig. 8 shows a blank which is cut transversely as at l0; the flaps l1being folded over on the dotted lines 12 to form t-he leg e. The sheetmetal blank is also cut as at 13, the outer portions of the blank beingcurled back to form the spring clips c and the jaws or fingers cl.

In some of the claims We have referred to the'web ot the clampunderlying the flange and the spring fingers as gripping the top of' theflange. These terms are simply used relatively as a clear means ofdesignating the parts. Gf course, it the auxiliary reenforcement be used'on a roiuinn, strictly speaking, the flange has no upper and lowersurface, but the flange can be read with this explanation in view Vhat Iclaim is:

l. An auxiliary reentorcement Jfor tying or supporting concrete on aheavy central reenforcement member orV core for conc-rete beams orcolumns, having in combination with a central flanged reenforcing coreof a plurality of sheet metal flange clamps which may be secured to thecentralV reen forcing core by springing the sheet Vmetal 2. A device forthe purpose'specified,V

comprising a sheetmetal member 'formed to provide a relatively Widespring gripping jaw, a laterally extending mould Wall spacer and aVcombined mould Wall spacer and 'hanger substantially at right anglesthere-V to, the said combined spacer and hanger serving to supportVauxiliary reenforcements.

A device for the purpose specified, comprising a sheet metal flangeclampformed from a single sheet of metal bent to form a pair of relativelyWide turned over spring fingers engaging the top or" one flange of. areenforcing member, and provided with a depending portion having lateralprojections for tying the surrounding concrete to the reenforcing memberat the center.

4:. A device for the purpose specified, comprisino' a sheet metal flangeformed into a web to underlie a flange of a. center reenforcement andprovided With turned n up spring fingers engaging the top of the flange,said flange clamp further provided with a turned down leg member havinga struck out tongue, said leg member and tongue serving to tie theconcrete to the center reenforcement. i

An auxiliary reenforcement 'for tying and supporting concrete on a heavycentral reenforcement member or core for con* crete beams or columns,having in combination With the central core, a plurality of independentsheet'metal flange clamps which may be secured to the flanges of thecentral reenforcing core by springing the sheet metal thereon, tyingmembers, said clamps having integral mould Wall spacers and means forsupporting said tying members for tying the surrounding concrete to thecentral core. Y Y

6. A reenforcement structure of the class described, comprising a sheetmetal mem- IDT) ber provided with a Web arranged to underlie one flangeof a central reeniforeement, and provided with turned up spring ingersengaging the top of the flange, transverse reenforeing means, said sheetmetal inember being further provided with a projecting member forsupporting said transverse means and additional reenfereing meanssupported by said transverse reenforcing means.

In testimony whereof I have afIiXed my signature.

VSAMUEL D. BUTTERWORTH.

